package com.mmall.util;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;


public class ZxingUtils {
    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    private static BitMatrix createBitmap(String str) {
        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
        try {
            return multiFormatWriter.encode(str, BarcodeFormat.QR_CODE, 256, 256);
        } catch (WriterException e) {
            e.printStackTrace();
            return null;
        } catch (IllegalArgumentException iae) { // ?
            return null;
        }
    }

    private static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }

    public static byte[] createCodeByte(String str) {
        final BitMatrix bitmap = createBitmap(str);
        if (bitmap == null) {
            return new byte[0];
        }
        final BufferedImage bufferedImage = toBufferedImage(bitmap);
        final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        try {
            ImageIO.write(bufferedImage, "jpg", byteArrayOutputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return byteArrayOutputStream.toByteArray();
    }
}


